Furnace core tube for rotary kiln

Abstract

To provide a furnace core tube for a rotary kiln in which only a furnace core tube body can easily be exchanged.SOLUTION: An end side packing member 50 and an internal packing member 58 are crushed in an axial direction between an inlet end face plate 52 and a packing gland 76, and are brought into contact with an outer circumferential face 40c of a furnace core tube body 40 and an inner circumferential face 46b of a seal drum 46 by being swelled in a radial direction. This seal drum 46 is the one to which a tire 62 is welded, and is coupled to the furnace core tube body 40 in a non-rotating state by the friction force of the end side packing member 50 and the internal packing member 58. Therefore, it is made possible that the seal drum 46 is removed from the furnace core tube body 40 by removing the packing gland 76, and only the furnace core tube body 40 is easily exchanged.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a furnace tube for a rotary kiln, which heats an object to be heated inside the furnace tube body from outside the furnace tube body while rotating the tubular furnace tube body around its axis. [Background technology]

[0002] The furnace tube for the rotary kiln includes a furnace tube body and a tire. The furnace tube body is tubular and receives powdered materials, and the materials are fired by being heated from the outside through the furnace tube body. The tire is attached to the outer periphery of the furnace tube body and is placed on rollers. The furnace tube body rotates around its axis on the rollers when a rotational force is applied, and the materials are fired while the furnace tube body is rotating. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-196848 Summary of the Invention [Problem to be solved by the invention]

[0004] In the case of the above-mentioned conventional furnace tube for a rotary kiln, the tire is fixed to the furnace tube body by welding. Therefore, when replacing the furnace tube body, the tire, which is less likely to need replacing than the furnace tube body, must be replaced along with the furnace tube body, making it difficult to easily replace the furnace tube body alone.

[0005] The present invention has been made in light of the above circumstances, and an object of the present invention is to provide a furnace tube for a rotary kiln in which only the furnace tube body can be easily replaced. [Means for solving the problem]

[0006] The gist of the first invention is a furnace tube for a rotary kiln, which comprises: (a) a tubular furnace tube body into which an object to be heated is introduced and tires attached to the outer periphery of the furnace tube body; (b) the tires are placed on rollers to enable the furnace tube body to rotate about its axis, and the object to be heated is fired by heating it from outside the furnace tube body while rotating the furnace tube body about its axis; and (c) a tire attached to the outer periphery of the furnace tube body, which forms a gap between the tire and the outer periphery of the furnace tube body. (d) a cylindrical member having an inner peripheral surface that supports the tire; (d) an annular end plate that is provided at one end of the cylindrical member and that blocks the gap from the axial direction; (e) a cylindrical packing member that is provided within the gap; (f) a pressing member that is provided at the other end of the cylindrical member and that presses the packing member in the axial direction to crush it between the end plate; and (g) the packing member contacts the inner peripheral surface of the cylindrical member and the outer peripheral surface of the core tube body, thereby connecting the cylindrical member to the outer peripheral part of the core tube body in a state where it is prevented from rotating around the axis.

[0007] The gist of the second invention of the furnace tube for a rotary kiln is that, in the first invention, (a) at least one of the end plate and the pressing member is detachably attached to the tubular member.

[0008] The gist of the furnace tube for a rotary kiln of the third invention is that, in the first invention, (a) the packing member comprises a plurality of annular packings arranged in the axial direction.

[0009] The gist of the fourth invention of the furnace tube for a rotary kiln is that, in the first invention, (a) an inner tubular member that is movable in the axial direction is provided within the gap, and the packing members are provided between the inner tubular member and the end plate and between the inner tubular member and the pressing member. [Effects of the Invention]

[0010] According to the first aspect of the present invention, a cylindrical packing member is provided in the gap between the outer circumferential surface of the muffle tube body and the inner circumferential surface of the tubular member. This packing member is crushed between the end plate and the pressure member, thereby contacting the outer circumferential surface of the muffle tube body and the inner circumferential surface of the tubular member. The tubular member is coupled to the outer circumferential portion of the muffle tube body in a rotation-preventing manner by the frictional force of the packing member. Therefore, the crushed packing member is released by removing the pressure member or the end plate from the tubular member, and the coupling between the muffle tube body and the tubular member is released by the crushed packing member. In this state, the tubular member is pulled out from the outer circumferential portion of the muffle tube body, removing the tire and the tubular member from the muffle tube body. This allows for easy replacement of the muffle tube body alone. Furthermore, welding the tire to the muffle tube body is unnecessary. This allows for the use of a muffle tube body made of a material that is difficult to weld, such as highly wear-resistant heat-resistant cast steel, metals under development, or ceramics, and also prevents the muffle tube body from becoming brittle due to welding.

[0011] According to the second aspect of the present invention, at least one of the end plate and the pressing member is detachably attached to the cylindrical member, so that the end plate or the pressing member can be easily removed from the cylindrical member, which makes it easier to release the crushed packing member, and makes it easier to replace only the core tube body.

[0012] According to the third aspect of the present invention, the cylindrical packing member is made up of a plurality of annular packings arranged in the axial direction, and the packing member can be attached to the muffle tube body by repeatedly inserting the annular packings onto the outer circumferential surface of the muffle tube body. This eliminates the need to press a long packing member into the outer circumferential surface of the muffle tube body in the axial direction, making it easier to attach the packing member to the muffle tube body.

[0013] According to the fourth aspect of the present invention, the inner tubular member is provided in the gap between the outer circumferential surface of the muffle tube body and the inner circumferential surface of the tubular member. This eliminates the need to fill the entire area between the outer circumferential surface of the muffle tube body and the inner circumferential surface of the tubular member with packing members, thereby reducing the amount of packing members used. Furthermore, the inner tubular member is provided in the gap so as to be movable in the axial direction. This ensures that the packing members on the end plate side are crushed by the end plate and the inner tubular member, and that the packing members on the pressing member side are crushed by the inner tubular member and the pressing member. Therefore, the two packing members are in close contact with the outer circumferential surface of the muffle tube body and the inner circumferential surface of the tubular member, respectively, strengthening the bonding force of the tubular member to the muffle tube body, thereby reliably preventing the tire from moving around the axis relative to the muffle tube body. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1(a) is a diagram showing a rotary kiln according to an embodiment of the present invention. [Figure 2] 2(a) is an enlarged view showing a part of the Xa portion of FIG. 1 in a partially cutaway manner, and FIG. 2(b) is an enlarged view showing a main part of FIG. 2(a). [Figure 3] 3(a) is an enlarged view showing a part of the Xb portion of FIG. 1 in a partially cutaway manner, and FIG. 3(b) is an enlarged view showing a main part of FIG. 3(a). DETAILED DESCRIPTION OF THE INVENTION

[0015] An embodiment of the present invention will now be described with reference to the drawings. [Example]

[0016] As shown in Fig. 1, a rotary kiln 200 is installed on the floor F of the factory. This rotary kiln 200 corresponds to the rotary kiln of the present invention, and is configured to include a frame 10, a base 16, a hydraulic cylinder 18, a drive motor 22, a chain 30, two inlet rollers 32a (only one is shown), two outlet rollers 34a (only one is shown), a heating chamber 36, and a furnace core tube 100.

[0017] 1, the gantry 10 is installed on a floor surface F, and the hydraulic cylinder 18 is fixed to the front end of the gantry 10. This hydraulic cylinder 18 has a piston rod 18a that can move back and forth in the vertical direction, and a horizontal slide shaft 20 is connected to the piston rod 18a. This hydraulic cylinder 18 corresponds to a lifting mechanism.

[0018] As shown in Fig. 1, a bracket 12 is fixed to the stand 10, and a base 16 is rotatably supported on the bracket 12 via a horizontal bed plate shaft 14. A long hole 16a extending in the front-to-rear direction is formed in the front end of the base 16. A slide shaft 20 of a hydraulic cylinder 18 is slidably inserted into this long hole 16a, and the base 16 rotates around the bed plate shaft 14 as the piston rod 18a moves forward and backward. In other words, the tilt angle of the base 16 with respect to the horizontal line is adjusted depending on the amount by which the piston rod 18a projects in the vertical direction.

[0019] The drive motor 22 corresponds to a drive source, and as shown in Figure 1, is suspended from the base 16 via a motor bracket 24. The drive motor 22 has a drive shaft 26 that faces in the front-to-rear direction, and a drive sprocket 28 is connected to the front end of the drive shaft 26. The chain 30 is endless and is looped around the drive sprocket 28.

[0020] 1, the two entrance rollers 32a are supported side by side in the left-right direction (depth direction on the paper) at the front end of the base 16. Each of these entrance rollers 32a is rotatably supported by the entrance roller bracket 32 ​​via a horizontal entrance roller shaft 32b, and each entrance roller 32a is supported by the base 16 via the entrance roller bracket 32. Each of these entrance rollers 32a corresponds to a roller in the present invention.

[0021] 1, the two exit rollers 34a are supported side by side in the left-right direction at the rear end of the base 16, and are disposed behind the two entrance rollers 32a. Each of these exit rollers 34a is rotatably supported by the exit roller bracket 34 via a horizontal exit roller shaft 34b, and each exit roller 34a is supported by the base 16 via the exit roller bracket 34. Each of these exit rollers 34a corresponds to a roller according to the present invention.

[0022] 1, the heating chamber 36 is installed on the base 16, and a heater (not shown) is installed inside the heating chamber 36. The furnace tube 100 is installed on the base 16 so as to be rotatable about an axial line AL of the furnace tube 100. This furnace tube 100 corresponds to the furnace tube of the present invention, and the central portion of the furnace tube 100 in the longitudinal direction, excluding the front and rear ends, is housed inside the heating chamber 36. The direction of rotation of this furnace tube 100 about the axial line AL corresponds to the direction around the axis of the present invention, and the direction of the axial line AL corresponds to the axial direction of the present invention.

[0023] As shown in FIG. 1, an inlet 40a is provided at the front end of the muffle tube 100. Powder materials such as negative electrode materials for lithium batteries, lead zirconate-based piezoelectric materials, and barium titanate-based dielectric materials, as well as pellet materials formed by granulating these powder materials, are introduced into the muffle tube 100 through the inlet 40a. These powder materials and pellet materials all correspond to the heated object of the present invention. The orientation of the muffle tube 100 changes depending on the tilt angle of the base 16. The tilt angle of the base 16 is set so that the muffle tube 100 descends at an angle of approximately 1° from front to rear.

[0024] The heater in the heating chamber 36 heats the powder material in the muffle tube 100 from outside the muffle tube 100. This heating of the powder material is performed while the muffle tube 100 rotates around its axis line AL. As the muffle tube 100 rotates, the powder material is transported from front to rear within the muffle tube 100 along the inclination of the muffle tube 100 and sintered. As shown in FIG. 1, a discharge port 40b is provided at the rear end of the muffle tube 100, and the powder material sintered inside the muffle tube 100 is discharged from the discharge port 40b to the outside of the muffle tube 100.

[0025] Next, the furnace tube 100 will be described. As shown in FIGS. 2(a) and 3(a), the furnace tube 100 includes a furnace tube main body 40, an inlet attachment mechanism 80, and an outlet attachment mechanism 90. The furnace tube main body 40 is cylindrical with a constant inner diameter and is made of quartz, ceramics, or other materials to which metals cannot be welded. The furnace tube main body 40 has superior wear resistance and corrosion resistance compared to stainless steel. A large-diameter portion 40d is formed in the center of the furnace tube main body 40 in the longitudinal direction. This large-diameter portion 40d has a larger outer diameter than the remaining portion of the furnace tube main body 40 excluding the large-diameter portion 40d. The large-diameter portion 40d of the furnace tube main body 40 is housed within the heating chamber 36.

[0026] Next, the inlet mounting mechanism 80 will be described. This inlet mounting mechanism 80 cooperates with the outlet mounting mechanism 90 to support the core tube main body 40 on the base 16 so that it can rotate about the axis. As shown in Figures 2(a) and 2(b), this inlet mounting mechanism 80 is composed of a sleeve 44, a seal drum 46, an end-side packing member 50, an inlet end plate 52, an inner packing member 58, a tire support 60, a tire 62, a packing gland support 68, a sprocket support 70, a driven sprocket 72, and a packing gland 76.

[0027] 2(a) and 2(b), the sleeve 44 is cylindrical and is inserted into the outer periphery of the muffle tube main body 40 so as to be slidable in the axial direction along the outer periphery 40c of the muffle tube main body 40. The sleeve 44 is made of stainless steel and corresponds to the inner tubular member of the present invention.

[0028] 2(a) and 2(b), the shield drum 46 is cylindrical and is inserted into the outer periphery of the core tube main body 40. The shield drum 46 is made of stainless steel, and the outer periphery of the sleeve 44 contacts the inner periphery 46b of the shield drum 46. The shield drum 46 corresponds to the cylindrical member of the present invention, and the axial length of the shield drum 46 is set to be larger than the axial length of the sleeve 44. A cylindrical gap 48 is formed between the inner periphery 46b of the shield drum 46 and the outer periphery 40c of the core tube main body 40.

[0029] 2(a) and 2(b), the end-side packing member 50 is cylindrical and inserted into the gap 48, and is disposed in front of the sleeve 44. This end-side packing member 50 corresponds to the packing member of the present invention and is composed of a plurality of end-side annular packings 50a arranged in the axial direction. Each of these end-side annular packings 50a is formed by weaving heat-resistant graphite fibers into an annular shape, with a rectangular cross section, and is inserted into the outer peripheral surface 40c of the core tube body 40. Each of these end-side annular packings 50a corresponds to the annular packing of the present invention.

[0030] 2(a) and 2(b), the inlet end plate 52 has an annular shape and is attached to the front end surface of the core tube main body 40. This inlet end plate 52 is made of stainless steel and is detachably attached to the seal ram 46 from the front by threading a plurality of screws 54 (only one is shown) into the front end of the seal ram 46 through the inlet end plate 52. The front end of this seal ram 46 corresponds to one end.

[0031] 2(b), the inlet end plate 52 closes the gap 48 between the outer peripheral surface 40c of the muffle tube main body 40 and the inner peripheral surface 46b of the shield drum 46 from the front, and corresponds to the end plate of the present invention. The inner diameter of this inlet end plate 52 is set smaller than the inner diameter of the muffle tube main body 40, and the inlet end plate 52 forms an inlet 40a for powder material at the front end of the muffle tube 100, the inlet end plate having a smaller diameter than the inner diameter of the muffle tube main body 40.

[0032] As shown in Fig. 2(b), a thin-walled portion 46a is formed at the rear end of the seal drum 46. This thin-walled portion 46a is thinner than the remaining portion of the seal drum 46 excluding the thin-walled portion 46a, and forms an expanded diameter portion 48a at the rear end of the gap 48. This expanded diameter portion 48a has a larger diameter than the remaining portion of the gap 48 excluding the expanded diameter portion 48a.

[0033] As shown in FIG. 2(b), the inner packing member 58 is cylindrical and inserted into the expanded diameter portion 48a. This inner packing member 58 is disposed behind the sleeve 44 and corresponds to the packing member of the present invention. This inner packing member 58 is composed of multiple inner annular packings 58a arranged in the axial direction. Each inner annular packing 58a is formed by weaving heat-resistant graphite fibers into an annular shape, resulting in a rectangular cross section. It is inserted into the outer peripheral surface 40c of the core tube body 40. The outer diameter of each inner annular packing 58a is larger than that of the end-side annular packing 50a, and the inner diameter of each inner annular packing 58a is the same as that of the end-side annular packing 50a. Each inner annular packing 58a corresponds to the annular packing of the present invention.

[0034] 2(b), the tire support 60 has a short cylindrical shape and is fixed by welding to the outer circumferential surface of the seal drum 46. The tire support 60 is made of stainless steel and has an integral annular support body 60a that protrudes outward toward the outer circumferential side.

[0035] As shown in FIG. 2(b), the tire 62 has an annular shape and is supported by the tire support 60. The tire 62 is mounted on the outer periphery of the sealed drum 46 and corresponds to the tire of the present invention. The tire 62 is made of carbon steel and has an annular supported portion 62a integrally formed therewith that protrudes inward. The tire 62 is removably attached to the tire support 60 by fastening the supported portion 62a and the support body 60a together with multiple sets of bolts 66a and nuts 66b. The tire 62 is placed on the two inlet rollers 32a of the base 16, as shown in FIG. 1.

[0036] 2(b), the packing gland support 68 is annular and is fixed by welding to the outer peripheral surface of the thin-walled portion 46a of the seal drum 46. The packing gland support 68 is made of stainless steel, and the sprocket support 70 is provided integrally with the packing gland support 68. The sprocket support 70 protrudes outward from the packing gland support 68 and is annular in shape and thinner than the packing gland support 68.

[0037] 2(b), the driven sprocket 72 has an annular shape and is supported by a sprocket support 70. The driven sprocket 72 is fastened to the sprocket support 70 by multiple sets of bolts 74a and nuts 74b, so that the driven sprocket 72 is detachably attached to the sprocket support 70. The chain 30 of the base 16 is hung on the driven sprocket 72, and a rotational force about the axis is applied to the core tube main body 40 from the drive motor 22 via the drive sprocket 28, the chain 30, and the driven sprocket 72.

[0038] As shown in Figure 2(b), the packing gland 76 has a short cylindrical shape and is supported by the packing gland support 68. The packing gland 76 is made of stainless steel and is provided at the rear end of the seal drum 46. A claw-shaped pressing portion 76a that surrounds the packing gland 76 is integrally formed at the front end of the packing gland 76. The packing gland 76 corresponds to the pressing member of the present invention, and the rear end of the seal drum 46 corresponds to the other end.

[0039] As shown in Figure 2(b), the packing gland 76 has an integral, annular supported portion 76b that protrudes outward. The packing gland 76 is detachably attached to the packing gland support 68 by threading a plurality of screws 78 (only one is shown) through the supported portion 76b and into the packing gland support 68. The pressing portion 76a of the packing gland 76 presses the inner packing member 58 forward from the rear. The inner packing member 58 presses the sleeve 44 forward from the rear, thereby pressing the end packing member 50 forward from the rear, and the end packing member 50 is pressed against the inlet end plate 52 by being pressed forward by the sleeve 44.

[0040] 2(b), the end-side packing member 50 is crushed in the axial direction between the inlet end plate 52 and the sleeve 44. This end-side packing member 50 expands radially as a result of being crushed in the axial direction, and by expanding radially, it is in close contact with the outer circumferential surface 40c of the muffle tube main body 40 and the inner circumferential surface 46b of the shield ram 46. The end-side packing member 50 couples the shield ram 46 to the outer circumferential portion of the muffle tube main body 40 in a non-rotational manner by means of frictional resistance against the outer circumferential surface 40c of the muffle tube main body 40 and the inner circumferential surface 46b of the shield ram 46.

[0041] 2(b), the inner packing member 58 is crushed in the axial direction between the sleeve 44 and the packing gland 76. This inner packing member 58 expands radially as a result of being crushed in the axial direction, and by expanding radially, it is in close contact with the outer peripheral surface 40c of the muffle tube main body 40 and the inner peripheral surface 46b of the seal ram 46. The inner packing member 58 couples the seal ram 46 to the outer periphery of the muffle tube main body 40 in a non-rotating manner due to the frictional resistance force between the outer peripheral surface 40c of the muffle tube main body 40 and the inner peripheral surface 46b of the seal ram 46.

[0042] The end-side packing member 50 and the inner packing member 58 each prevent the powder material from leaking from inside the muffle tube main body 40 to the outside, and reduce the amount of heat transferred from inside the muffle tube main body 40 to the tire 62 and the driven sprocket 72. In other words, the end-side packing member 50 and the inner packing member 58 each have heat resistance and sealing properties.

[0043] As shown in Figure 2(b), a plurality of screws 42 (only one is shown) are threaded into the seal drum 46 from the outer periphery. These multiple screws 42 are arranged in a line in the circumferential direction, and each screw 42 is inserted into an elongated hole 44a. This elongated hole 44a is formed in the sleeve 44 and allows the sleeve 44 to slide forward when the packing gland 76 is not attached to the packing gland support 68. The tip of each screw 42 contacts the outer periphery 40c of the core tube body 40, and the multiple screws 42 prevent the sleeve 44 from shifting around the axis.

[0044] The inlet attachment mechanism 80 is detachably attached to the core tube body 40, and to remove the inlet attachment mechanism 80 from the core tube body 40, all of the screws 42 are loosened, allowing the sleeve 44 to slide backward. Next, all of the screws 78 are unscrewed, removing the packing gland 76 from the seal drum 46. In this state, the pressing force acting from the packing gland 76 on the end-side packing member 50 and the inner packing member 58 disappears, allowing the end-side packing member 50 and the inner packing member 58 to expand to their initial states before being crushed.

[0045] With the packing gland 76 removed, the core tube body 40 and the shield ram 46 are no longer connected, making it possible to pull the shield ram 46 forward from the outer periphery of the core tube body 40. The inlet end plate 52, tire 62, and driven sprocket 72 are all fixed to the shield ram 46, and are pulled forward from the outer periphery of the core tube body 40 together with the shield ram 46. The end packing member 50 is pushed forward by the sleeve 44 and is pulled forward from the outer periphery of the core tube body 40.

[0046] To reattach the inlet attachment mechanism 80 to the core tube body 40, the screws 42, sleeve 44, end packing member 50, inner packing member 58, and packing gland 76 are removed, and the seal ram 46 is inserted from the front onto the outer periphery of the core tube body 40. In this state, the end packing member 50, sleeve 44, and inner packing member 58 are inserted from the rear into the gap 48 between the outer periphery 40c of the core tube body 40 and the inner periphery 46b of the seal ram 46, and the packing gland 76 is fixed to the packing gland support 68 with the screws 78. The end packing member 50 and inner packing member 58 are then crushed axially and expand radially, reconnecting the seal ram 46 to the core tube body 40 through the frictional resistance of the end packing member 50 and inner packing member 58. Next, the screws 42 are threaded into the seal ram 46, and the sleeve 44 is locked against the seal ram 46.

[0047] Next, the outlet mounting mechanism 90 will be described. This outlet mounting mechanism 90 cooperates with the inlet mounting mechanism 80 to support the core tube main body 40 on the base 16 so that it can rotate about the axis. As shown in Figures 3(a) and 3(b), this outlet mounting mechanism 90 is configured to include a sleeve 44, a seal drum 46, an end-side packing member 50, an inner packing member 58, a tire support 60, a tire 62, a packing gland support 68, a packing gland 76, and an outlet end plate 92. This outlet mounting mechanism 90 differs from the inlet mounting mechanism 80 in that it does not include the inlet end plate 52, the sprocket support 70, or the driven sprocket 72.

[0048] The sleeve 44, seal drum 46, end packing member 50, inner packing member 58, tire support 60, gland support 68, and gland 76 of the outlet mounting mechanism 90 are the same as those of the inlet mounting mechanism 80 described above. The tire 62 of this outlet mounting mechanism 90 differs from the tire 62 of the inlet mounting mechanism 80 in that, as shown in FIG. 1 , it is placed on two outlet rollers 34a of the base 16. That is, when the drive motor 22 is operating, a rotational force is applied from the drive sprocket 28 to the driven sprocket 72 of the inlet mounting mechanism 80 via the chain 30. When the drive motor 22 is operating, the two inlet rollers 32a and two outlet rollers 34a (a total of four) rotate, allowing the core tube body 40 to rotate about its axis.

[0049] The outlet end plate 92 of the outlet attachment mechanism 90 is made of stainless steel and has an annular shape, as shown in Figures 3(a) and 3(b). This outlet end plate 92 corresponds to the end plate of the present invention and covers the gap 48 between the outer peripheral surface 40c of the muffle tube body 40 and the inner peripheral surface 46b of the seal drum 46 from the rear. This outlet end plate 92 is detachably attached to the seal drum 46 by threading a plurality of screws 94 (only one is shown) through the outlet end plate 92 into the seal drum 46 of the outlet attachment mechanism 90 from the rear. The inner diameter of this outlet end plate 92 is set to be the same as the inner diameter of the muffle tube body 40, and the outlet end plate 92 forms a powder material discharge port 40b at the rear end of the muffle tube 100, which is the same size as the inner diameter of the muffle tube body 40.

[0050] According to the above embodiment, the inlet mounting mechanism 80 includes a cylindrical end packing member 50 and a cylindrical inner packing member 58 provided in the gap 48 between the outer peripheral surface 40c of the core tube body 40 and the inner peripheral surface 46b of the shield ram 46. The end packing member 50 and the inner packing member 58 are each crushed in the axial direction between the inlet end plate 52 and the packing gland 76, causing them to expand radially. The end packing member 50 and the inner packing member 58 expand radially, thereby coming into contact with the outer peripheral surface 40c of the core tube body 40 and the inner peripheral surface 46b of the shield ram 46, respectively. The shield ram 46 is coupled to the outer periphery of the core tube body 40 by the frictional forces of the end packing member 50 and the inner packing member 58, preventing it from rotating about the axis. Therefore, removing the packing gland 76 from the seal ram 46 releases the crushed end-side packing member 50 and the inner packing member 58. This release of the crushed end-side packing member 50 and the inner packing member 58 releases the connection between the muffle tube body 40 and the seal ram 46. In this state, the seal ram 46 is pulled out from the outer periphery of the muffle tube body 40, removing the tire 62 and the seal ram 46 from the muffle tube body 40. This allows for easy replacement of the muffle tube body 40 alone. Furthermore, there is no need to weld the tire 62 to the muffle tube body 40. This allows for the use of a muffle tube body 40 made of a material that is difficult to weld, such as highly wear-resistant heat-resistant cast steel, metals currently under development, or ceramics, and also prevents the muffle tube body 40 from becoming brittle due to welding. The same effect applies to the outlet attachment mechanism 90.

[0051] According to the above embodiment, the packing glands 76 are detachably mounted on the seal drum 46 for each of the inlet attachment mechanism 80 and the outlet attachment mechanism 90, so that the packing glands 76 can be easily removed from the seal drum 46. This facilitates the work of releasing the crushed end-side packing members 50 and the inner packing members 58, making it possible to more easily replace only the core tube body 40.

[0052] According to the above embodiment, the cylindrical end-side packing member 50 of the inlet attachment mechanism 80 is composed of a plurality of end-side annular packings 50a arranged in the axial direction. Therefore, the end-side packing member 50 can be attached to the outer circumferential surface 40c of the core tube main body 40 by repeatedly inserting the end-side annular packings 50a into the outer circumferential surface 40c of the core tube main body 40. This eliminates the need to push a single axially long packing member onto the outer circumferential surface 40c of the core tube main body 40, making it easier to attach the end-side packing member 50 to the core tube main body 40. This effect also applies to the end-side packing member 50 of the outlet attachment mechanism 90. This effect also applies to the inner packing member 58 of the inlet attachment mechanism 90 and the inner packing member 58 of the outlet attachment mechanism 90.

[0053] According to the above embodiment, with regard to the inlet mounting mechanism 80, the sleeve 44 is provided in the gap 48 between the outer peripheral surface 40c of the core tube body 40 and the inner peripheral surface 46b of the seal drum 46. This eliminates the need to fill the entire gap 48 with the end-side packing member 50 or the inner packing member 58, thereby reducing the amount of end-side packing member 50 or the inner packing member 58 used. Furthermore, the sleeve 44 is provided in the gap 48 so as to be movable in the axial direction. This ensures that the end-side packing member 50 is crushed reliably by the inlet end plate 52 and the sleeve 44, and that the inner packing member 58 is crushed reliably by the sleeve 44 and the packing gland 76. Therefore, the end packing member 50 and the inner packing member 58 are tightly attached to the outer peripheral surface 40c of the muffle tube body 40 and the inner peripheral surface 46b of the seal drum 46, respectively, thereby strengthening the bonding force of the seal drum 46 to the muffle tube body 40, thereby reliably preventing the tire 62 from shifting about the axis relative to the muffle tube body 40. The same effect applies to the outlet mounting mechanism 90.

[0054] According to the above embodiment, for each of the inlet attachment mechanism 80 and the outlet attachment mechanism 90, an inner packing member 58 having a larger diameter than the end packing member 50 is provided at the end of the sealed ram 46 on the heating chamber 36 side. This makes it difficult for heat to be transferred from inside the heating chamber 36 to the end of the sealed ram 46 on the heating chamber 36 side, effectively suppressing temperature increases in the tire 62 and the driven sprocket 72.

[0055] Although the preferred embodiment of the present invention has been described above with reference to the drawings, the present invention is not limited to this and may be implemented in other modes.

[0056] In the above embodiment, the inclination angle at which the furnace core tube body 40 descends from front to rear is exemplified as "1°", but the inclination angle at which the furnace core tube body 40 descends from front to rear is not limited to "1°".

[0057] In the above embodiment, the end-side packing member 50 of the inlet mounting mechanism 80 and the inner packing member 58 may be released from being crushed by removing the inlet end plate 52 of the inlet mounting mechanism 80 from the seal drum 46 .

[0058] In the above embodiment, the end-side packing member 50 of the outlet attachment mechanism 90 and the inner packing member 58 may be released from being crushed by removing the outlet end plate 92 of the outlet attachment mechanism 90 from the seal drum 46 .

[0059] In the above embodiment, the sleeve 44 may be replaced by a plurality of end-side annular packings 50a.

[0060] In the above embodiment, a furnace tube body 40 having a ceramic inner tube attached to the inner circumferential surface of a metal outer tube, or a furnace tube body 40 made of metal such as stainless steel may be used.

[0061] In the above embodiment, a straight furnace tube body 40 without the large diameter portion 40d may be used.

[0062] In the above embodiment, the end side annular packing 50a and the inner annular packing 58a may be made of a material other than graphite, as long as they are made of an elastic material that has both heat resistance and sealing properties.

[0063] In the above embodiment, the materials to be heated that are put into the furnace core tube 100 are exemplified as powder materials such as negative electrode material for lithium batteries, lead zirconate-based piezoelectric materials, and barium titanate-based dielectric materials, as well as pellet materials made of pellet-shaped particles obtained by granulating these powder materials. However, the materials to be heated that are put into the furnace core tube 100 are not limited to these materials.

[0064] Although not specifically illustrated, the present invention can be implemented with various modifications within the scope of the gist of the invention. [Explanation of symbols]

[0065] 32a: inlet roller (roller), 34a: outlet roller (roller), 40: furnace tube body, 40c: outer circumferential surface, 44: sleeve (inner cylindrical member), 46: shield drum (cylindrical member), 46b: inner circumferential surface, 50: end side packing member (packing member), 50a: end side annular packing (annular packing), 52: inlet end face plate (end face plate), 58: inner packing member (packing member), 58a: inner annular packing (annular packing), 62: tire, 76: packing gland (pressing member), 92: outlet end face plate (end face plate), 100: furnace tube, 200: rotary kiln

Claims

1. A furnace tube for a rotary kiln includes a tubular furnace tube body into which an object to be heated is introduced and tires attached to the outer periphery of the furnace tube body, the tires being placed on rollers to allow the furnace tube body to rotate about its axis, and the object to be heated is fired by heating the object from outside the furnace tube body while the furnace tube body is rotating about its axis, a cylindrical member provided on an outer periphery of the muffle tube body, the cylindrical member having an inner periphery surface forming a gap between the inner periphery surface of the muffle tube body and supporting the tire; an annular end face plate provided at one end of the cylindrical member and closing the gap in the axial direction; a cylindrical packing member provided in the gap; a pressing member provided at the other end of the cylindrical member and configured to press the packing member in the axial direction to crush it between the packing member and the end plate, A furnace tube for a rotary kiln, characterized in that the packing member connects the cylindrical member to the outer periphery of the furnace tube body in a state where it is prevented from rotating around the axis by contacting the inner periphery of the cylindrical member and the outer periphery of the furnace tube body.

2. 2. The furnace tube for a rotary kiln according to claim 1, wherein at least one of the end plate and the pressing member is detachably attached to the cylindrical member.

3. 2. The furnace tube for a rotary kiln according to claim 1, wherein the packing member comprises a plurality of annular packings arranged in the axial direction.

4. an inner cylindrical member that is axially movable is provided within the gap; 2. The furnace tube for a rotary kiln according to claim 1, wherein the packing members are provided between the inner tubular member and the end plate and between the inner tubular member and the pressing member.

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